!429 修复自定义组件`file-upload`无法显示第一个文件，列表显示的文件比实际文件少一个的问题

Merge pull request !429 from hjk2008/master

-<template>
-  <div class="upload-file">
-    <el-upload
-      :action="uploadFileUrl"
-      :before-upload="handleBeforeUpload"
-      :file-list="fileList"
-      :limit="limit"
-      :on-error="handleUploadError"
-      :on-exceed="handleExceed"
-      :on-success="handleUploadSuccess"
-      :show-file-list="false"
-      :headers="headers"
-      class="upload-file-uploader"
-      ref="upload"
-    >
-      <!-- 上传按钮 -->
-      <el-button size="mini" type="primary">选取文件</el-button>
-      <!-- 上传提示 -->
-      <div class="el-upload__tip" slot="tip" v-if="showTip">
-        请上传
-        <template v-if="fileSize"> 大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b> </template>
-        <template v-if="fileType"> 格式为 <b style="color: #f56c6c">{{ fileType.join("/") }}</b> </template>
-        的文件
-      </div>
-    </el-upload>
-
-    <!-- 文件列表 -->
-    <transition-group class="upload-file-list el-upload-list el-upload-list--text" name="el-fade-in-linear" tag="ul">
-      <li :key="file.uid" class="el-upload-list__item ele-upload-list__item-content" v-for="(file, index) in fileList">
-        <el-link :href="`${baseUrl}${file.url}`" :underline="false" target="_blank">
-          <span class="el-icon-document"> {{ getFileName(file.name) }} </span>
-        </el-link>
-        <div class="ele-upload-list__item-content-action">
-          <el-link :underline="false" @click="handleDelete(index)" type="danger">删除</el-link>
-        </div>
-      </li>
-    </transition-group>
-  </div>
-</template>
-
-<script>
-import { getToken } from "@/utils/auth";
-
-export default {
-  name: "FileUpload",
-  props: {
-    // 值
-    value: [String, Object, Array],
-    // 数量限制
-    limit: {
-      type: Number,
-      default: 5,
-    },
-    // 大小限制(MB)
-    fileSize: {
-      type: Number,
-      default: 5,
-    },
-    // 文件类型, 例如['png', 'jpg', 'jpeg']
-    fileType: {
-      type: Array,
-      default: () => ["doc", "xls", "ppt", "txt", "pdf"],
-    },
-    // 是否显示提示
-    isShowTip: {
-      type: Boolean,
-      default: true
-    }
-  },
-  data() {
-    return {
-      baseUrl: process.env.VUE_APP_BASE_API,
-      uploadFileUrl: process.env.VUE_APP_BASE_API + "/common/upload", // 上传的图片服务器地址
-      headers: {
-        Authorization: "Bearer " + getToken(),
-      },
-      fileList: [],
-    };
-  },
-  watch: {
-    value: {
-      handler(val) {
-        if (val) {
-          let temp = 1;
-          // 首先将值转为数组
-          const list = Array.isArray(val) ? val : this.value.split(',');
-          // 然后将数组转为对象数组
-          this.fileList = list.map(item => {
-            if (typeof item === "string") {
-              item = { name: item, url: item };
-            }
-            item.uid = item.uid || new Date().getTime() + temp++;
-            return item;
-          });
-        } else {
-          this.fileList = [];
-          return [];
-        }
-      },
-      deep: true,
-      immediate: true
-    }
-  },
-  computed: {
-    // 是否显示提示
-    showTip() {
-      return this.isShowTip && (this.fileType || this.fileSize);
-    },
-  },
-  methods: {
-    // 上传前校检格式和大小
-    handleBeforeUpload(file) {
-      // 校检文件类型
-      if (this.fileType) {
-        let fileExtension = "";
-        if (file.name.lastIndexOf(".") > -1) {
-          fileExtension = file.name.slice(file.name.lastIndexOf(".") + 1);
-        }
-        const isTypeOk = this.fileType.some((type) => {
-          if (file.type.indexOf(type) > -1) return true;
-          if (fileExtension && fileExtension.indexOf(type) > -1) return true;
-          return false;
-        });
-        if (!isTypeOk) {
-          this.$message.error(`文件格式不正确, 请上传${this.fileType.join("/")}格式文件!`);
-          return false;
-        }
-      }
-      // 校检文件大小
-      if (this.fileSize) {
-        const isLt = file.size / 1024 / 1024 < this.fileSize;
-        if (!isLt) {
-          this.$message.error(`上传文件大小不能超过 ${this.fileSize} MB!`);
-          return false;
-        }
-      }
-      return true;
-    },
-    // 文件个数超出
-    handleExceed() {
-      this.$message.error(`上传文件数量不能超过 ${this.limit} 个!`);
-    },
-    // 上传失败
-    handleUploadError(err) {
-      this.$message.error("上传失败, 请重试");
-    },
-    // 上传成功回调
-    handleUploadSuccess(res, file) {
-      this.$message.success("上传成功");
-      this.fileList.push({ name: res.fileName, url: res.fileName });
-      this.$emit("input", this.listToString(this.fileList));
-    },
-    // 删除文件
-    handleDelete(index) {
-      this.fileList.splice(index, 1);
-      this.$emit("input", this.listToString(this.fileList));
-    },
-    // 获取文件名称
-    getFileName(name) {
-      if (name.lastIndexOf("/") > -1) {
-        return name.slice(name.lastIndexOf("/") + 1).toLowerCase();
-      } else {
-        return "";
-      }
-    },
-    // 对象转成指定字符串分隔
-    listToString(list, separator) {
-      let strs = "";
-      separator = separator || ",";
-      for (let i in list) {
-        strs += list[i].url + separator;
-      }
-      return strs != '' ? strs.substr(0, strs.length - 1) : '';
-    }
-  }
-};
-</script>
-
-<style scoped lang="scss">
-.upload-file-uploader {
-  margin-bottom: 5px;
-}
-.upload-file-list .el-upload-list__item {
-  border: 1px solid #e4e7ed;
-  line-height: 2;
-  margin-bottom: 10px;
-  position: relative;
-}
-.upload-file-list .ele-upload-list__item-content {
-  display: flex;
-  justify-content: space-between;
-  align-items: center;
-  color: inherit;
-}
-.ele-upload-list__item-content-action .el-link {
-  margin-right: 10px;
-}
-</style>
+<template>
+  <div class="upload-file">
+    <el-upload
+      :action="uploadFileUrl"
+      :before-upload="handleBeforeUpload"
+      :file-list="fileList"
+      :limit="limit"
+      :on-error="handleUploadError"
+      :on-exceed="handleExceed"
+      :on-success="handleUploadSuccess"
+      :show-file-list="false"
+      :headers="headers"
+      class="upload-file-uploader"
+      ref="upload"
+    >
+      <!-- 上传按钮 -->
+      <el-button size="mini" type="primary">选取文件</el-button>
+      <!-- 上传提示 -->
+      <div class="el-upload__tip" slot="tip" v-if="showTip">
+        请上传
+        <template v-if="fileSize"> 大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b> </template>
+        <template v-if="fileType"> 格式为 <b style="color: #f56c6c">{{ fileType.join("/") }}</b> </template>
+        的文件
+      </div>
+    </el-upload>
+
+    <!-- 文件列表 -->
+    <transition-group class="upload-file-list el-upload-list el-upload-list--text" name="el-fade-in-linear" tag="ul">
+      <li :key="file.url" class="el-upload-list__item ele-upload-list__item-content" v-for="(file, index) in fileList">
+        <el-link :href="`${baseUrl}${file.url}`" :underline="false" target="_blank">
+          <span class="el-icon-document"> {{ getFileName(file.name) }} </span>
+        </el-link>
+        <div class="ele-upload-list__item-content-action">
+          <el-link :underline="false" @click="handleDelete(index)" type="danger">删除</el-link>
+        </div>
+      </li>
+    </transition-group>
+  </div>
+</template>
+
+<script>
+import { getToken } from "@/utils/auth";
+
+export default {
+  name: "FileUpload",
+  props: {
+    // 值
+    value: [String, Object, Array],
+    // 数量限制
+    limit: {
+      type: Number,
+      default: 5,
+    },
+    // 大小限制(MB)
+    fileSize: {
+      type: Number,
+      default: 5,
+    },
+    // 文件类型, 例如['png', 'jpg', 'jpeg']
+    fileType: {
+      type: Array,
+      default: () => ["doc", "xls", "ppt", "txt", "pdf"],
+    },
+    // 是否显示提示
+    isShowTip: {
+      type: Boolean,
+      default: true
+    }
+  },
+  data() {
+    return {
+      baseUrl: process.env.VUE_APP_BASE_API,
+      uploadFileUrl: process.env.VUE_APP_BASE_API + "/common/upload", // 上传的图片服务器地址
+      headers: {
+        Authorization: "Bearer " + getToken(),
+      },
+      fileList: [],
+    };
+  },
+  watch: {
+    value: {
+      handler(val) {
+        if (val) {
+          let temp = 1;
+          // 首先将值转为数组
+          const list = Array.isArray(val) ? val : this.value.split(',');
+          // 然后将数组转为对象数组
+          this.fileList = list.map(item => {
+            if (typeof item === "string") {
+              item = { name: item, url: item };
+            }
+            item.uid = item.uid || new Date().getTime() + temp++;
+            return item;
+          });
+        } else {
+          this.fileList = [];
+          return [];
+        }
+      },
+      deep: true,
+      immediate: true
+    }
+  },
+  computed: {
+    // 是否显示提示
+    showTip() {
+      return this.isShowTip && (this.fileType || this.fileSize);
+    },
+  },
+  methods: {
+    // 上传前校检格式和大小
+    handleBeforeUpload(file) {
+      // 校检文件类型
+      if (this.fileType) {
+        let fileExtension = "";
+        if (file.name.lastIndexOf(".") > -1) {
+          fileExtension = file.name.slice(file.name.lastIndexOf(".") + 1);
+        }
+        const isTypeOk = this.fileType.some((type) => {
+          if (file.type.indexOf(type) > -1) return true;
+          if (fileExtension && fileExtension.indexOf(type) > -1) return true;
+          return false;
+        });
+        if (!isTypeOk) {
+          this.$message.error(`文件格式不正确, 请上传${this.fileType.join("/")}格式文件!`);
+          return false;
+        }
+      }
+      // 校检文件大小
+      if (this.fileSize) {
+        const isLt = file.size / 1024 / 1024 < this.fileSize;
+        if (!isLt) {
+          this.$message.error(`上传文件大小不能超过 ${this.fileSize} MB!`);
+          return false;
+        }
+      }
+      return true;
+    },
+    // 文件个数超出
+    handleExceed() {
+      this.$message.error(`上传文件数量不能超过 ${this.limit} 个!`);
+    },
+    // 上传失败
+    handleUploadError(err) {
+      this.$message.error("上传失败, 请重试");
+    },
+    // 上传成功回调
+    handleUploadSuccess(res, file) {
+      this.$message.success("上传成功");
+      this.fileList.push({ name: res.fileName, url: res.fileName });
+      this.$emit("input", this.listToString(this.fileList));
+    },
+    // 删除文件
+    handleDelete(index) {
+      this.fileList.splice(index, 1);
+      this.$emit("input", this.listToString(this.fileList));
+    },
+    // 获取文件名称
+    getFileName(name) {
+      if (name.lastIndexOf("/") > -1) {
+        return name.slice(name.lastIndexOf("/") + 1).toLowerCase();
+      } else {
+        return "";
+      }
+    },
+    // 对象转成指定字符串分隔
+    listToString(list, separator) {
+      let strs = "";
+      separator = separator || ",";
+      for (let i in list) {
+        strs += list[i].url + separator;
+      }
+      return strs != '' ? strs.substr(0, strs.length - 1) : '';
+    }
+  }
+};
+</script>
+
+<style scoped lang="scss">
+.upload-file-uploader {
+  margin-bottom: 5px;
+}
+.upload-file-list .el-upload-list__item {
+  border: 1px solid #e4e7ed;
+  line-height: 2;
+  margin-bottom: 10px;
+  position: relative;
+}
+.upload-file-list .ele-upload-list__item-content {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  color: inherit;
+}
+.ele-upload-list__item-content-action .el-link {
+  margin-right: 10px;
+}
+</style>